The only reasons people think snowboarding is prohibitive is because they're in a resort mindset and have insecurity about their fits. That's fine, but so is the hill by your house and the clothes you have. This is about re-framing the act.
A year skateboarding for someone that's okay is as costly, if not more than snowboarding.
Used snowboard, bindings, boots: $600 | New snowboard, bindings, boots: $800-2000.
Used outerwear: Hey, nice jeans with sweatpants underneath.
Six new decks a year with grip: $400-420. | Four pairs of shoes a year (new): ~200 (low end)
$620/yr. $2480/4yrs for skateboarding vs. $500-2000 over four years for snowboarding. I made those numbers up, but if any of you math capital heads want to roll on me with some fucking #s, feel free to waste your time and mine.
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Have fun out there.